Child keys

components.todo-item.js

import Ember from 'ember';

const { computed } = Ember;

export default Ember.Component.extend({
  tagName: '',
  text: computed.oneWay('todo.text'),
  json: computed('todo.{id,text}', function() {
    return JSON.stringify(this.get('todo'));
  }),
});

components.todo-list.js

import Ember from 'ember';

export default Ember.Component.extend({
  init() {
    this._super(...arguments);
    this.set('todos', [
      {id:1, text:'foo'},
      {id:2, text:'bar'},
    ]);
  },
  json: Ember.computed('todos.{id,text}', function () {
    return JSON.stringify(this.get('todos'));
  }),
  actions: {
    reverse() {
      this.set('todos', this.get('todos').slice().reverse());
    },
  },
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{todo-list}}
<br>
<br>

templates.components.todo-item.hbs

<div>
  {{todo.id}}
  <input value={{text}} />
  {{json}}
</div>

templates.components.todo-list.hbs

{{#each todos as |todo|}}
  {{todo-item todo=todo}}
{{/each}}
<button onclick={{action 'reverse'}}>Reverse</button>

<br>
<br>
{{json}}

twiddle.json

{
  "version": "0.13.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.13.0",
    "ember-template-compiler": "2.13.0",
    "ember-testing": "2.13.0"
  },
  "addons": {
    "ember-data": "2.16.3"
  }
}